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Friend of mine is a Lexus tech and we have been looking at the specs of the 1UZ-FE and the 1UR-FE/FSE and it looks like Lexus LOOSENED the specs for the 1UR-FE/FSE compared to the 1UZ-FE (89-00 at least). He has a 98 ES300 and has run 0W20 in his for the past couple years with zero issues and...

that is what i want as i have a 98 gs400.

Showed my wife one (94-97 is my guess) a couple days ago, she said it is ugly and she won't be seen in it.... She wants a newer Charger.

Was thinking of recommending a LS400 (98-00) to my mom and dad who are thinking of selling a Honda minivan and get another car. They are older, but would like a comfy car again since they sold their Deville and got a Camry (boy was that a shock for a change!). So after having a GS400 now for...

Any chance these original pictures are still around?

Yup! Thanks!!! Was toying with the idea of Magnaflows. I want flow, but really don't want noise/drone at all. I had a Hooker cat back for a GN Regal on my 85 Cutlass with the I think Super Comp mufflers and it sounded awesome inside, no drone, no excessive noise.

Anyone have a picture of the 98-05 GS400/GS430 exhaust?

I commonly post Jim Hand's story on exhaust. People argue that you can't have flow without loud noise. Yes, the dyno and the quarter mile and sound meter prove it. Old thread, but very worthy good read on this story. Also gives idea, Jim ran low 12's on 2.5" duals with a 7.5L 455...

Anyone ever confirm? I would GUESS 251, that is very close to stock hp, 271's could support 330 hp (NA not boosted). The OEM's usually don't factor in room to "grow", they set it dead on where they expect it to be and go for it, it is better for low flow driveability and emissions.

Not really, I am a PCM tuner (GM and Ford engines, primarily GM from 1994-2011) and I can tune hundreds to thousands of items on a GM PCM. So I am trying to figure out what IS there at all on a Lexus V8 to work with. I haven't even SEEN a single piggyback or replacement ECU that can be put in...

Where do I find out more on the piggyback ECU? I can't seem to really find anything at all. What can you do with them? Are they tuneable or ??

Would be great to get cruise rpm down to around 1600 rpm at 75 mph and still have a lot of gear still when you drop down a few. How do I find out about the tiptronic kit? Is it a real tiptronic shifter and controller? Or does it eliminate auto shifting all together?

What stick do people use for them? 6 speed? Would be nice to be able to row my own gears. The guy I got the car from said if it had a stick he would never sell it.

Admittedly, I would rather a 6 speed manual. This car would do WELL for mpg if I could get cruise rpms down. What is the "tiptronic" setup like? Full manual shift all the time?

Welcome!!! Car looks nice, just have to get that steering put back on the correct side! :)

What does it take to make the 1UZFE cars (GS) have a manual shift pattern like the 01-05 3UZFE cars and the 98-00 2JZ cars (GS)? The shift buttons on the wheel I feel are a joke really. When I need them the wheel is turned, doesn't do me much good to go look for shift buttons when you are...

Every application is different, an LS might lose, a GS might gain, all depends on the specific application. It is sorta like adding plenum volume just before the runners inside the intake. At some conditions, it hurts (usually low flow) at higher flow it helps. Doing just fine with English...

Still have the ECU?

I am about 90 miles west of Chicago....

We always must be cautious that we can outthink the factory engineers who designed, dyno tested and reliability tested these engines (I have worked in electrical hardware engineering for automotive). A little resistor to make 60 hp when the factory "couldn't" do it, right.... You'll find more...